[time-nuts] Building a GPSDO & trouble using Jupiter-T

Azelio Boriani azelio.boriani at screen.it
Mon Jan 30 06:06:20 EST 2012


OK, so it is a common practice.

On Mon, Jan 30, 2012 at 11:43 AM, <EWKehren at aol.com> wrote:

> Where can you get a LEA-6T for $ 65?
> Bert Kehren
>
>
> In a message dated 1/30/2012 5:34:56 A.M. Eastern Standard Time,
> bruce.griffiths at xtra.co.nz writes:
>
> The  100PPS output from Motorola receivers is phase jerked every second
> in the  same fashion.
>
> Bruce
>
> Azelio Boriani wrote:
> > OK, now I know  and wonder if other GPS receivers that have frequency
> > outputs behave  in this manner. For example the Motorola 100PPS output,
> the
> > uBlox  800Hz, the Navsync variable frequency output and so on. It is
> > possible  to compute solutions from GPS satellite at greater than 1
> second
> > rate  so the phase of these signals should be adjustable at a rate that
> >  could minimize the phase jump... this is only my opinion, not the real
> >  possibility.
> >
> > On Mon, Jan 30, 2012 at 11:15 AM, Bruce  Griffiths<
> > bruce.griffiths at xtra.co.nz>   wrote:
> >
> >
> >> The 10kHz is continuous but  its phase jerked on the second.
> >> The new phase is held until the  next jerk.
> >>
> >> Bruce
> >>
> >>
> >>  Azelio Boriani wrote:
> >>
> >>
> >>> Ah, is it a burst of 10KHz once a second? I don't have a  Jupiter-T and
> I'm
> >>> a PPS-type discplining fan but I thought it  was a continuous 10KHz.
> >>>
> >>> On Mon, Jan 30, 2012  at 10:33 AM, Attila Kinali<attila at kinali.ch>
> wrote:
> >>>
> >>>
> >>>
> >>>
> >>>> On Sun, 29 Jan 2012 00:50:35  -0600
> >>>> Ray Xu<rayxu123 at gmail.com>    wrote:
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>> For those who have  experience using the Jupiter T GPS:
> >>>>> I have bought  this
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>  http://www.ebay.com/itm/**Navman-jupiter-T-Tu60-GPS-Kit-**
> >>>>
> 1pps-10khz-GPS-Module-/**260790984470<
> http://www.ebay.com/itm/Navman-jupiter-T-Tu60-GPS-Kit-1pps-10khz-GPS-Module-/260790984470
> >
> >>>>
> >>>>  Ouch... For that price you get already a new LEA-6T, which is a state
>  of
> >>>> the art timing GPS receiver. Beside having the better  sensitivity
> >>>> (more satelites in difficult conditions) it  features also an
> frequency
> >>>> output that can go up to 10MHz  (or 8MHz if you want low  jitter).
> >>>>
> >>>>
> >>>>    Attila Kinali
> >>>> --
> >>>> The  trouble with you, Shev, is you don't say anything until you've
> saved
> >>>> up a whole truckload of damned heavy brick arguments  and then you
> dump
> >>>> them all out and never look at the  bleeding body mangled beneath the
> heap
> >>>>       -- Tirin, The Dispossessed, U. Le  Guin
> >>>>
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